Fix indentation problem for comments in call chains

Before:
SomeObject
    // Calling someFunction on SomeObject
        .someFunction();

After:
SomeObject
    // Calling someFunction on SomeObject
    .someFunction();

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@186085 91177308-0d34-0410-b5e6-96231b3b80d8